Konstantin Koltsov, the Belarusian former pro ice hockey player and boyfriend of tennis player Aryna Sabalenka, has died at the age of 42, Russian club Salavat Yulaev said in a statement on Tuesday.

Forward Koltsov played for the Belarus national team in the 2002 and 2010 Olympics and spent parts of three seasons with the National Hockey League’s Pittsburgh Penguins from 2002 and 2006.

“It is with deep sorrow that we inform you that the coach of Salavat Yulaev, Konstantin Koltsov, has passed away,” Salavat Yulaev, which is based in the Russian city of Ufa, said in the statement.

Koltsov was in the United States (Miami)